Release notes for 1.0.0 (2014-03-26)

(I would like to thank, among others, @stepanb and Microsoft Czech for their support.)

Major new features:

  • built-in automatic STL repair
  • OpenGL 3D preview of the repaired file (thanks to iXce for the initial work); also supports multi-material files
  • ability to override individual config options for each object in the same print job
  • new support material rewritten from scratch
  • new Ooze Prevention feature for multiple extruders (park extruders outside skirt and drop temperature by a specified delta)

  • options to avoid starting loops on convex vertices and/or overhangs

  • volume calculation

  • ability to customize how materials are mapped to extruders

  • new First Layer Acceleration option

  • new option to use firmware-controlled retraction (G10/G11)

  • new option to use a distinct extruder for support material interface


  • Slic3r is now much faster because many mature parts of code were rewritten in C++ for faster processing and less memory usage (Slic3r is now 40% C++)
  • most of memory is now truly shared between threads, reducing the total footprint
  • improved infill patterns and bridge detection
  • the automated test suite was largely enriched
  • don’t combine retract and travel anymore when using G0 (Mach3 compatibility)
  • better Makerbot (Makerware/Sailfish) compatibility
  • Windows binaries are now built with Expat for faster AMF parsing

Minor improvements:

  • new [layer_num] placeholder in layer-change G-code
  • custom G-code can be supplied via command line too
  • some options were renamed or rearranged for clarity
  • new –info command line option to get information about the file
  • add .ngc to supported G-code suffixes
  • the wizard now saves initial profiles automatically
  • automatically copy Simple Mode settings into a ‘Simple Mode’ preset in Expert Mode


  • layer height ranges are scaled automatically when object is scaled in plater
  • avoid G92 E0 for sailfish output
  • the “Infill every n layers” option was renamed to “Combine infill every n layers” to clarify its purpose

Bugfixes (1.0.0 final):

  • crash when using the Infill only where needed option
  • bridge speed was not used for the first solid layer above sparse infill
  • a few models were sliced incorrectly and had solid bridges in random places
  • exporting binary STL files produced corrupt results on Windows
  • holes were not sorted using a nearest-neighbor search, resulting in inefficient paths
  • crash when user entered Unicode characters in notes
  • wrong wiping moves for hole perimeters were calculated for the second copy of an object

Bugfixes (1.0.0RC3):

  • facets were completely reversed because of an overflow triggered by STL files with very large coordinates
  • rectilinear infill was exceeding perimeters when using very low layer height
  • random lack of infill caused by recent changes aimed at reducing memory usage
  • incorrect number of raft layers was geenrated when too few were requested
  • fatal error in the rare case that a bridge has no valid anchor points
  • fatal error when concentric infill generated too tight loops
  • spiral vase generated some wrong layers
  • when processing with fill_density = 0, top/bottom solid shells were missing regions thinner than three times the extrusion width
  • the M73 command used with makerware/sailfish G-code flavor exceeded 100% under certain circumstances

Bugfixes (1.0.0RC2):

  • the Windows 64-bit package was missing an OpenGL library
  • the Linux packages were missing XML::SAX thus weren’t able to load AMF files
  • a regression caused all perimeter holes to be completed doing contours instead of finishing one island at time
  • retraction restarts ignored the extrusion_axis setting
  • objects could not be repositioned in plater after hitting the Split button
  • Z moves were skipped after the first object was complete when using Sequential Printing
  • objects were incorrectly placed in exported STL files
  • fixed a fatal error related to thin walls
  • fixed random crashes (mostly visible on 32-bit Windows)
  • the Avoid Crossing Perimeters implementation was rewritten in order to fix some regressions and make it faster
  • fan wasn’t enabled when vibration limit or another internal post-processor was enabled
  • raft wasn’t generated for the entire object footprint
  • thin walls came out as zig-zag paths instead of straight lines
  • narrow gaps were not infilled under certain circumstances

Bugfixes (1.0.0RC1):

  • several threading issues were fixed
  • some situations causing incomplete infill were fixed
  • fixed regression causing wrong direction for inwards move in holes, thus little blobs
  • fix crash on Windows when username had non-ASCII characters
  • some spiral vase prints had little gaps in the loops
  • Z-offset was not applied to spiral vase prints
  • lift was not working correctly with multiple extruders and multiple skirt layers
  • fix speed math for wipe, which was causing too fast retraction
  • other minor fixes